Yokogawa Standalone MW100 - Manual (Page 74)

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IM MW100-01E
Also, when a condition in which alarm output must be cleared arises, you can select
whether to turn output relays OFF (Non-hold), or leave them ON until an output clear
command (alarm ACK) appears (Hold).
Hold operation Notation Description
Hold On Maintains relay output even after relay output is cancelled.
Non-Hold Off Does not maintain relay output when relay output is cancelled
(normal operation).
Output cause
occurrence
• When set to non-hold • When set to hold
Relay output
ON
OFF
Output cause
occurrence
Relay output
ON
OFF
Alarm ACK Alarm ACK
100ms
Relay Operation
The following types of relay operation are available.
Operation Description
And Output ON when all alarms assigned to each alarm output relay activate.
Or
Output ON when one or more alarms assigned to each alarm output relay activate.
Reflash Function
The relay operates after the first alarm. If a second alarm activates, the relay restarts
after briefly stopping operation.
• The non-operation period is 200 ms.
• Even if a new alarm occurs during the non-operation, the non-operation time is not
extended.
• The number of output relays that can be specified for the reflash function is unlimited.
• When selecting relay output other than alarm output relays, the reflash function
specification is disabled.
• You can specify the reflash function when OR is selected for the AND/OR function and
Non-Hold is selected for the Hold/Non-Hold function.
Alarm2 status
Alarm1 status
Alarm3 status
Reflash function
relay status
200ms 200ms
1.14 Functions of the 10-CH, Medium-Speed Digital Output Module